Heat all three burners of the gas grill, with the mesh grill pan sitting on it. When the grill is hot, place the almonds on it and let them brown, covered, for 3 minutes. Stir them, cover, and cook until their color deepens, an additional 2 minutes. Strew them with the sugar, as evenly as you can, stir them, and cook, stirring from time to time, until they pop and are quite golden, an additional 3 to 4 minutes. The sugar that doesn’t stick to the almonds may send up some curls of smoke; don’t be concerned.